Opus Grows Mix #3 is blended for better drainage, perfect for those who water heavy and feed often. Made in-house in Eugene, Oregon, Mix #3 is a biologically enhanced soil with mycorrhizae and a shot of Bio-Tope® cultured compost. Use as a professional style potting soil in patio planters and boxes, and all types of cloth or polycan grower containers. Opus Grows Mix #3 is OMRI listed and approved for organic growing.